Once dry used a router to trim the headplate down and then filed down to the headstock shape.
Very carefully drilled the holes through. Taped the front of the headplate to try and avoid chipping and then drilled through with a small bit. Used a hole reamer to slowly come out to the required diameter.
Did a bit of a mock up to see what would look like with black hardware. Will fit different tuners as the ones fitted look too small.